#include <iostream>
using namespace std;
int main() {
int sum = 0;
// loop through the first 100 natural numbers and add them to sum
for (int i = 1; i <= 100; i++) {
sum += i;
}
// print the sum
cout << "The sum of the first 100 natural numbers is " << sum << endl;
return 0;
}

This program declares an integer variable called`sum`

and initializes it to 0. It then uses a for loop to iterate through the first 100 natural numbers (i.e., 1 to 100), adding each number to`sum`

. Finally, it prints out the value of`sum`

using the`cout`

statement.